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Package received, everything there, thank you!
C
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This one that blew up had the older style chips. no 5v at the 5v test point.
Out of curiosity I checked my other Jally that has two of the new style of chip. That one has 5v present at the 5v test point.
Hm. I've seen that too. My weird jally didn't have 5 volts but it seems to be running well now. Maybe they put it in sometimes. I think i'll just RMA it.
I have 5 ASIC chips on the way so i'll pop 3 on the replacement and two on my other one. (this is how i came accross this thread in the first place. I remembered the post with the blown u15 pics)
That sounds best. I've got 4 chips outside in the mailbox I think; I'll put one of them on my weird jally, taking it to 5 and the other on my other new jally taking it to six on an old-style heat sink. I think that might wind up being a problem, but my water block is not coming till Monday at the earliest. And I get to look at another blown board. Fun! Speaking of chip placements, put another one on a 2 chip jally for a friend, no problems. I'm actually waiting 5 minutes with preheat now, until I see the faint wisp of smoke/flux come up, then a count to 90 with the air tool at 450c. The hardest part is placing the chip perfectly on the balls, but I have had a 100% success rate since I started using a loupe to verify all the balls. C |
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Kimcoin? Every 32 blocks it kills random amounts of minted coin.
Anyway, does one have to redownload the cpuminer when the block splits? Or just the wallet?
C
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So, in anticipation of that, what is the exact part number of the FTDI chip that I should order, and possibly from where? I do have a hot air station, so that part will be easy, but what temperature should I set it at so as not to melt the chip body?
Thanks in advance!
For chips with legs, I'd go with 400c for 30 seconds tippy tops. See how long it takes to get them off, then use a bit less than that to get the new one on. You don't need anywhere near as long heat for the chips with legs. |
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OK at the test points I have: 1.01V, 0.0001V, 0V, 13.1V
should I have 5v?
Eh. I think the 5 volt circuit was on some boards and not others. Technically it's only needed for the LCD display, whatever that was. However lack of 3.3 volts will end it. Resistance between ground and:
1v = 41ohm
3.3v = 0.20 ohm
5v = 2.9k ohm
12V = 2k ohm
Yep, confirmed short on the 3.3 volt line. Given that all of the chips use 3.3 volts it could be anything. I'd say do an RMA on it, but I do wonder what blew up the 3.3 volt line. C |
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Fired the CPU miner back up. 10k hash underway.
I wonder if there is a way to pay miners to mine catcoin to get out of this trap.
C
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Hm, yep that's the 4 amp 3.3 volt power supply. Out of curiosity what happens when you plug it in now?
Do you have a volt meter and know how to use it? I'd be really curious to see if the 1 volt power line is up; it feeds off the 12 volt supply line. If that's working and the 3.3 volt short could be cleared you could power the board up with a small bench supply and it might work again. But man that is a serious hack.
Speaking of serious hacks, I have a board coming in with a blown set of 1 volt FETs. I'm going to try powering it off the danger board with jumper wires; technically it might work. Then again the voltage drop might be too much but what the heck?
:-) Keeps me out of trouble.
C
I just get the red light near the power connector, none of the other LED's light up at the front or back. I have a multimeter to test with. I just need to know where to test. I haven't had a chance to look at the board layout and see what is what. I'ts certainly the most tightly packed board I have ever had to look at. It's not too bad. Grab the schematics by googling for sc-mainboard-1.0, it's a PDF from BFL. Once opened take a look at the board layout. On the opposite side from the power plug (top side) you will see a square hole, then a space, then five more holes. Right by the JTAG port. Those are the voltage test points. They are: ground 1-volt 3.3-volts 5.0-volts 12 volts. All reference to ground. See what you find with the board plugged in. C |
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Rumor has it, newer jallies are 3 chippers, anyone messed with one yet?
I have not, but others have at the jally jumping thread. It's a pretty reasonable idea; we've found that the cases and fans can support 3 chips without too much oddness, going to 4 stresses the power supply, 5 stresses the heat sink and six means time for a new heat sink. 7 should be water cooling and I might have to use LN2 for eight. Time will tell. But a 3 chip jally will put out a pretty honest 12gh with good chips. |
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That's why I have been recommending putting a 7 amp fuse in series with your jally when running it on 300-800 watt supplies. 12 volts at 7 amps will do minor things. 12 volts at 50 amps will do a bit more.... Despite my intentions to do so, I didn't (install a fuse) and thats exactly what happened to the board coming your way. Ah. So what I see when I tested a shorted jally (and I have shorted the danger board a *lot* as of late) is the crow-baring of the cheap-o BFL power supply and not a failure of the 1 volt supply to come up into a short. That is interesting, I wonder how much power it sourced before blowing up. Probably a lot. :-) Ok, then my protocol of testing a newly balled jally with a BFL supply in all cases is sound. That's good to know. C |
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Hm, yep that's the 4 amp 3.3 volt power supply. Out of curiosity what happens when you plug it in now?
Do you have a volt meter and know how to use it? I'd be really curious to see if the 1 volt power line is up; it feeds off the 12 volt supply line. If that's working and the 3.3 volt short could be cleared you could power the board up with a small bench supply and it might work again. But man that is a serious hack.
Speaking of serious hacks, I have a board coming in with a blown set of 1 volt FETs. I'm going to try powering it off the danger board with jumper wires; technically it might work. Then again the voltage drop might be too much but what the heck?
:-) Keeps me out of trouble.
C
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Here's an interesting question:
How many catcoin supporters are running the CPU miner *right now* to help out the network?
Embarassingly I am not, as my post a few pages back shows, the difficulty jump wiped out my little 10k hash mining ability. However not doing it is exactly what everyone else is not... doing.
So... Who is running the miner right now in an inefficient manner? Answer that question and you have answered the future of catcoin.
C
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Well, the higher difficulty knocked me out of the running with my CPU miner, so I'll be not-mining for a bit. However I do think there is a place for a smaller value coin than bitcoin, the risk of screwing up a transaction in btc is amazing.
C
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Being in a coma is exceptionally boring. Hopefully someone is talking to him. For some reason I laughed out loud at this.  I do too, it's ok. :-) |
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He is in a medically induced coma, right? Since it is a temporary coma, I don't think he will remain unconscious for too long.
Being in a coma is exceptionally boring. Hopefully someone is talking to him. |
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Remove the chip again, and check the resistance on the 3.3V rail. If it's below about 10 ohms or so, something is shorted and that's what keeps blowing the ST1S10.
Shorts on a main power rail like that are a huge PITA to debug. Depending on what you have available, there's a couple ways to find out what the issue is. The easiest way I know is to hook a lab supply at 3.3V up to 3.3V rail and turn the current limiting down. Grab an IR camera, and turn up the current until you see a hot spot. You can do the same with an IR thermometer, but it's more time consuming. A finger work too, but you need get the problem a lot hotter that way, and if it's something that's a QFN or one of the ASICs you might never notice it get hotter.
Without a current limited lab supply, it becomes more of a crapshoot. It's probably not worth trying to debug yourself if that's the case.
Yup. However the 3.3 volt supply on a jalapeno is really pretty small. Even the 1 volt supply will just crowbar and die if shorted (verified on the danger board); what blows things up in the FET world is when the FETs short due to overheat on high loads. Then if you feed it from an unlimited 12 volt supply (as opposed to the little supplies BFL sends) then the weakest component will explode. That's why I have been recommending putting a 7 amp fuse in series with your jally when running it on 300-800 watt supplies. 12 volts at 7 amps will do minor things. 12 volts at 50 amps will do a bit more.... Having bench top power supplies is a godsend; I have a pair of them myself and can feed all three voltages to a board. Oddly enough I am getting a board with blown FETs on it, I'm debating checking the 1 volt rail, clearing the failures, and trying to power it off the danger board's 1 volt supply. A double-headed jalapeno. :-) It keeps my mind working. C |
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You blew up U15 as well? Hm, interesting; wonder why that is failing.
I think that is the 3.3 volt supply line, if you want to send it over I can take a look at it. I'm sure though they will honor the RMA. Drug, did swapping that chip fix it?
C
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I pulled a really late one last night and didn't turn in until after 4. Just got up.
Confirm receipt of the .2, I'm on my way to Uncle Sam's Pony Express to get your chips on their way.
(Need coffee badly)
Oh ok, I thought you were in one of those weird European time zones. Thanks for getting this all together, and thanks for the extra part things. Keeps my mind occupied. C |
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Morning! Payment sent. *yawn*
*looks around* What everyone isn't on the East Coast? Need to remember that morning is a concept in the bitcoin world.
C
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Well, it looks like Danger labs is going for the gold. I just picked up six of these, will distribute as follows: Jally 1: 6 chip to 8 chips (+2) Looks like the water cooling block may come in handy. Jally 2: 5 chips to 7 chips (+2) Jally 3: 5 chip (this is the bad board one) to 7 chips (+2). Might as well set it alight as well. This will cover my three dead chips; I'll use my last good chip for a friend's jally, giving him a 12gh unit that can be used or sold without super cooling. My reballs I'll put on the danger board if I can, what's the worst that can happen? I am going so straight to hell here. But it's all for... research. Right. Crap, I just realized something: I have one other chip, and one of my slots is bad. So I can only do four. UG. Will request update, if seller does not agree will honor 6 chip request. PS: I'd ordered two PCI-E to 3 Plug custom power cables when I placed my order. They were not in the box. Logged back into BFL's site and checked my invoice, and it clearly shows I paid $29.98 for the cables and also indicates that they were shipped. I wrote an inquiry to office@butterflylabs.com, but to date have not received a reply. Same here. At this point it's pointless to get the cable; I'm already at full power here. I guess I can just ask BFL to send me a chip or something instead. Or my money back. :-) C |
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Four at .2 btc. That should replace the three clunks and give me one more for something....
Damn me. Damn me to hell :-)
C
(edit: I just realized I only need 4 chips. Since I made an offer for six I will honor it at .3btc, seller's option)
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